Raisecom RC831-240E User Manual page 19

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OFF
OFF
OFF
OFF
ON
ON
Note: The loopback control function provides two ways of loopback testing: single E1 loopback or all E1
loopback. When conducting single loopback testing, the communication of other E1 lines will not be affected.
For the status combinations of Bit 1~4 that are not listed in the table above, there will be no E1 loopback.
Bit 5
OFF
ON
BER Tester
ON OFF
ON OFF
ON ON
ON ON
OFF OFF
ON ON
Bit 5: loopback point selection switch
When setting loopback testing using the first 4 bits of SW1, Bit 5 of SW1 is used for
selecting the loopback point, that is, deciding whether the loopback is a remote loopback or a
local one. The loopback point of the remote E1 loopback and local E1 loopback are shown in
the Figure 4-1 and Figure 4-2, respectively.
Loopback point selection
Remote E1 loopback
Local E1 loopback
Figure 4-1 The settings of "remote loopback" on the local PDH multiplexer
Sid
E1
e
Local
Figure 4-2 The settings of the "local loopback" on the local PDH multiplexer
OFF E1 4 loopback
ON E1 5 loopback
OFF E1 6 loopback
ON E1 7 loopback
OFF E1 8 loopback
ON All E1 loopback
Fiber
User Manual
Sid
E1
e
Remot
e
11